1. Scan one number at a time
Instead of scanning a whole cell for all nine possibilities, pick one number (say, 7) and scan the entire board for where it can and can't go. It's faster and less overwhelming.
2. Use pencil marks generously
On Medium difficulty and above, jot down every number that could still fit in a cell using Notes. Patterns become much easier to spot once candidates are written down.
3. Look for the single candidate
If a cell has only one possible number left after you eliminate the others, it's safe to fill in — even if you're not 100% sure why, trust the elimination.
4. Master box-line reduction
If a number can only appear in one row or column within a box, it can be eliminated from that row or column everywhere outside the box too.
5. Work the easiest region first
Start with the row, column or box that already has the most numbers filled in — it has the fewest possibilities left, so it's usually the fastest to finish.
6. Don't guess
If you're not sure a number is correct, it probably isn't. Sudoku always has a logical reason for every placement — take a breath and look again rather than guessing.
7. Take breaks on hard puzzles
Stepping away for a minute and coming back with fresh eyes often reveals a pattern you were staring right past.
8. Use hints strategically
Save a hint for a cell that's truly stuck, rather than the first tricky moment — it'll often unblock several other cells around it.
9. Recheck after every few moves
Every time you place a few numbers, a quick rescan of nearby rows, columns and boxes often reveals new single candidates you missed the first time.
10. Play a little every day
Short, regular Sudoku sessions build pattern recognition faster than occasional long ones — which is exactly what the Daily Challenge and streak are designed to encourage.